Quarterly report pursuant to Section 13 or 15(d)

BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Consolidated Statements of Comprehensive Income (Details)

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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Consolidated Statements of Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Net loss $ (484,802) $ 234,956 $ 62,242 $ 95,150 $ 111,319 $ 90,090 $ (187,604) $ 296,559
Comprehensive (loss) income (486,866)     98,202     (182,257) $ 290,744
Accumulated Deficit                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Net loss (484,802) $ 234,956 $ 62,242 $ 95,150 $ 111,319 $ 90,090    
As Reported                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Net loss (48,752)           248,446  
Comprehensive (loss) income (50,816)           253,793  
As Reported | Accumulated Deficit                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Net loss (48,752)              
Adjustments                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Net loss (436,050)           (436,050)  
Comprehensive (loss) income (436,050)           $ (436,050)  
Adjustments | Accumulated Deficit                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Net loss $ (436,050)